wiring 2 horns

Hi Intrepid, you can connect a horn or an additional siren with a relay. Connect the siren output from the alarm to #85 of an SPDT relay and connect #86 to 12V+ if the siren output is (-) or connect it to ground if the siren output is (+). Connect  #30 to 12V+ and connect #87 to the positive lead of the siren you are adding. If you're adding a horn and not a siren, you'll want to use a 12V flasher inline on the lead coming from the relay (#87) to the horn. 

the12volt

thanks 12 volt!

 one more question if i use the horn will it sound when i arm/disarm the alarm i have a viper 300+ and i think there is a feature to stop the horn from making noise during arm/disarm. is this still the way to hook the horn up to do this?

Hi Intrepid, you're welcome. If you're using the flasher and relay on the siren output of the alarm, the horn may or may not sound when you arm and disarm it depending on the duration of the arm and disarm chirps, but yes, this it the correct way to add it if you do not have a dedicated horn output from the alarm. If it does sound when you arm and disarm the alarm and you want to stop it, the easiest solution is to turn off the arm and disarm chirps on your alarm (feature 2) or change the siren output (feature 11) in programming.

the12volt

Hi guys,

Can you explain why you have to use the flasher to add a horn to the siren output?  Is this because the horn would otherwise send out a continuous sound...and instead the flasher  will make it "honk honk honk" with the siren?

And just to double check your hookup in the previous posts, I should do the following:

• #85 ---> siren output from alarm (+)
• #86 ---> 12v+
• #30 ---> 12v+
• #87 ---> flasher ---> to the (+) lead of my horn
• #87a--> tape off

Thanks!

DO you have to take the alarm out of the constant siren output?....and switch it to pulsed?  If pulsed, then what would the siren sound like?

Also, I went to check out the 12v flashers at a car parts store...and they had ones with 2 terminals and ones with 3 terminals.  Which is the one I would need....2?

THANKS!!!!

No, you want the siren output to remain constant if you are using a flasher inline with the horn. You want the flasher with the two terminals. Your application is the same as shown below but instead of flashing lights, you'll be honking the horn.

the12volt